package lab01;

/**
 * Created by Administrator on 2017/12/17.
 */
public class Test05_2 {
    public static void main(String[] args) {
        int n = 100;
        System.out.println(sum1(n));
        System.out.println(sum2(n));
        System.out.println(sum3(n));
    }

    public static int sum1(int n) {
        int sum = 0;
        for (int i = 1; i <= 100; i++) {
            sum = sum + i;
        }
        return sum;
    }

    public static int sum2(int n) {
        int sum = 0, i = 1;
        while (i <= n) {
            sum = sum + i;
            i++;
        }
        return sum;
    }

    public static int sum3(int n) {
        int sum = 0, i = 1;
        do {
            sum = sum + i;
            i++;}
            while (i <= n);
        return sum;
    }
}

